
Pour the contents of a pudding cup into a small bowl.
If desired, add food coloring and stir until combined.
Add ¼ cup of cornstarch and mix it in with a spoon. Repeat with a second ¼ cup of cornstarch, kneading with your hands when it becomes too difficult to stir with a spoon.
Work in more cornstarch with your hands, one tablespoon at a time, until the play dough is no longer sticky and you're happy with its consistency. Play immediately.